Because the meaning is it is pleasing to her, the to is built into the structure. So gustar never uses lo, la, los or las: it uses le and les.
to be pleasing to, not to please
The same inverted shape, and for the same reason: better stored with the to included.
Me interesa · ¿Te interesa? · ¿No te interesa? · ¿Por qué no te interesa? · Le interesa · Les interesa · ¿Te interesaría? · Me interesaría verlo
Me parece · Me parece bien · No me parece bien · No le parece bien · ¿No le parece bien?
With parecer, English already supplies the to: it seems to me. Note that for it seems good Spanish uses bien (well), not bueno. There is a grey area between the two that you pick up by listening.
In English that is optional: it seems to me he doesn't like it. In Spanish the que must be there.
Me parece que no quiere salir esta noche · Me parece que no le gusta
Spanish highlights that what is the question version of that, with que and qué being the same word. English shows it too, once you notice the pattern.
that → what · there → where · then → when
Swap the initial t for a w and you get the question word each time.
Another preposition Spanish does without. I want to put salt on it needs no word for on: the le carries it.
Quiero ponerle sal · Me gustaría ponerle sal · Me gustaría ponerle un poco más sal · Me gustaría ponerles un poco más sal
That last one is for putting salt on several things, las papas fritas for instance.
In componer the com- is really con-, with the n changing next to the p, so it literally means "with putting", putting together.
Quiero ponerlo aquí · Me gustaría ponerlo aquí · ¿Le interesa salir a bailar esta noche?